Registers – Transfer mechanism – Traveling pawl
Patent
1975-12-19
1977-08-09
Smith, Jerry
Registers
Transfer mechanism
Traveling pawl
179 71R, 235 92TE, G06F 1520
Patent
active
040412911
ABSTRACT:
A battery powered hand held or telephone snap-on computer programmed digital calculator instrument, for simultaneously timing, computing and calculating cost plus tax of a running long distance telephone toll call (LDTTC) in dollars & cents ($ & .cent.) and flashing same on a digital display readout screen. A caller feeds toll cost numbers into a calculator register via a numerically marked push-button key board...and sets a fixed charge selector switch to (1) or (2) minutes. At the start of a (LDTTC) caller presses a START BAR, actuating the computer programmed digital calculator circuits to perpetually flash ($ & .cent.) of a running (LDTTC) on a digital display screen. At the end of said call, caller presses STOP BAR, again actuating the computer programmed digital calculator circuits to compute tax on final total simultaneously storing grand total into an accumulative digital storage register while flashing same on a digital display screen. Accumulative (LDTTC) totals can be retrieved and flashed on a digital display screen or erased anytime by pressing appropriately marked push buttons.
REFERENCES:
patent: 3002684 (1961-10-01), Luscher
patent: 3097266 (1963-07-01), Luscher
patent: 3164677 (1965-01-01), Morris et al.
patent: 3769463 (1973-10-01), Graham et al.
patent: 3865994 (1975-02-01), Bender
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